Rotary scraper



J. H. KERBER ROTARY SCRAPER Nov. 12, 1935.

Fild Aug. 28, 1933 2 Sheets-Sheet l INVENTOR HJWW 80ml: $.M I ATTORNEY J. H. KERBER ROTARY SCRAPER 7 Filed Aug. 28, 1935 1 2 Sheets-Sheet 2 INVENTOR' ATTORNEY l l l l l Patented Nov. 12, 1935 attests no'rAar sonerna Application August 28, 1933, Serial No. 687,057

7 Claims.

The invention relates to rotary scrapers.

The object of the invention is to provide a rotary scraper wherein the movements of the scraper bucket to its different positions are con- 5 trolled by mechanism which is positive in its action.

A further object of the invention is to provide a rotary scraper wherein the hauling bail has a linked. connection with the bucket which coop- 10 erates with stop mechanism to control the movements of the bucket.

A further object of the invention is to provide a rotary scraper wherein the momentum of the rotary bucket is used to bring the scraper to its digging position.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings:

Fig. l is a side elevation view of a rotary scraper embodying the invention;

Fig. 2 is a plan view of the device, parts being broken away and parts being shown in section;

Fig. 3 is a detail sectional View taken on the line 3-3 of Fig. 2. v

Referring to the drawings, the scraper bucket, as usual, includes the end plates 4, the body plate 5, the shoes 6, the scraper blade I and the trunnions 8 secured to said end plates;

A hauling bail 9, forming part of the hauling frame, is reinforced by the transverse frame bar It and the centrally disposed frame bar I I to which a drawbar hitch of any suitable construction is secured. Each arm I2 of the hauling bail is connected by links it to opposite end portions of .a control bar M whose end Hi has a trunnion bearing portion I6 for the cooperative trunnion 8. i

The scraper bucket has a dragging position, a digging position, and a spreading position. The movement of the bucket to digging and spreading positions is brought about by the tendency of the bucket to, revolve in a counterclockwise direction, as viewed in Fig. 1, when the device is hauled forward, and means hereinafter described are associated with the hauling connections above described and cooperate with stops on the bucket to hold it in the positions above named The stop lever H is pivotally connected to each control bar 54 by a pivot pin it) and has a yoke portion is adapted to engage said bar and carries aroller 2t! engageable with either the digging stop 2| or the spreading stop 22 secured to the adjacent end plate 3 of the bucket. The digging stop 2I is adjustably secured to the bucket by having a serrated face engageable with the serrated face 23 of a plate 3t secured to the bucket, said stop Qibeing clamped in adjusted position to the plate 24 by a bolt 25. The spreading stop 22 is adjustably secured to the bu ket by providing an,-

gularly spaced holes 22 for the clamping bolt of said stop.

Each lever H is connected by a link 26 to the slotted end 27 of a trip lever 28 mounted on a trip shaft 29 'pivotally mounted at its ends in the bars It.

The trip shaft 29 is turned by the operation of release lever 30 secured intermediate its ends thereto, the lower arm of said lever being connected to the hauling frame member H by a spring it, the upper end of said lever having an operating cable 32 connected thereto.

Each trip lever 28 has a latch arm 33 formed integral therewith and adapted to engage a keeper 34' secured to the hauling frame member I0 adjacent the arm I2 when the bar I4 associated with said lever is moved to a digging position. When in its lowered position, movement of the outer end of each bar I4 is limited by the adjustable stop bolt 35 mounted on a part of the hauling frame.

When in its upper position, movement of each bar I4 relative to the hauling frame is limited by the engagement of the links I3 at the inner end I5 of each bar with a stop member 36. Each stop member 36 is mounted to swing on a bolt 31 carried by the bar I4 and is secured in various angular positions by a locking nut 38 having an adjustable serrated faced engagement with a part of the member 36 and clamped thereto by a clamping bolt 39.

The dragging position of the scraper bucket and its hauling frame is shown in full lines in Fig. 1 and it will be noted that the latch arm 33 is in a release position and that the roller 2!] of the stop. lever I! is engaged with the stop 2| on the bucket and that the rear link I3 is engaging the stop 36. Consequently, whilethebucket tends to turn so as to swing the blade 1 downward, this tendency is resisted by the action of 40 the hauling frame through the links I3 upon the bars Ii tending to swing said bars upwardly and thus maintain the stop roller 29 in the position shown, it being noted that under these conditions the rear links I3 engage the stops 36 so that the bars I4 and arms l2 associated with these parts act as a unit to pull the bucket along the ground. The bucket is brought to its dragging position fromits digging position.

With the bucket in the dragging position shown in full lines in Fig. 1, it is moved by the traction device to the place where it is desired to deposit the load and the controls are then operated to bring the bucket to a spreading position. This is brought about by swinging the upper arm of the release lever 38 toward the left from the full line position shown causing the levers 28 to pull on the links 26 and swing the levers Il' upwardly so as. to move the rollers 20 out of engagement with the stops 2| and allow the bucket to turn until the stops 22 come into engagement with the stop rollers 20 which have been returned to initial full line position through the return movement of the release lever 38 to the position shown. In its spreading position the bucket slides on the shoes 6 and the blade I is in a downwardly inclined position as shown, for example, by the vertically inclined position shown by dotted lines in Fig. l. The operator carries the bucket in its spreading position until he is ready to dig.

When he is ready to dig the lever 30 is again moved toward the left so as to act through the levers 28 and links 25 to move the levers I! upwardly to a release position so that the rollers 20 are moved out of engagement with the stops 22 and then as the assembly is dragged forwardly the bucket is turned about its pivotal mounting until the stops 2| again come to an operative position. As soon as the rollers 20 have been released from the stops 22 so as to permit this turning action the lever 36 is moved so as to bring the stop lever I! again to an operative position. In the return of the levers ll by the operation of the lever 30 the lost motion in the connection between the links 25 and the slots 21 is first taken up and thereafter the levers 28 act directly on the links 26 to swing the levers IT to their operative or control position. In the final position of the lever 30 in the return of said levers l I to their control position it occupies the dotted line position shown in Fig. 1 from which it may be moved to the full line position shown in Fig. 1 without exerting any pull on the levers l1, due to the lost motion connection between the links 26 and slotted ends 21. For the digging condition of the bucket the lever 30 is allowed to assume the dotted line position shown in Fig. 1 so that the latch 33 associated with said lever will trip by the upper bevelled edge of the keeper 34 and engage under said keeper 34 when the bar M is moved toward the bail arm 12. The movement of the bars l4 toward the bail arms !2 to effect the locking engagement of the latches 33 with the keepers 34 and bring the bucket to a digging position is brought about by the stops 2|, under the momentum of the rotary bucket, striking the rollers 20 with suflicient force to move the bars Hi to the digging position.

With the parts in a digging position, when the lever 30 is operated to release the latch 33 from the keeper 34 the pull of the hauling frame acts through the links I3 on the stops 36 to swing the bars [4 upwardly to the full line position shown so that the loaded bucket is in its dragging position and may be dragged to the place where its load is to be deposited.

the bucket in" a digging position is positively effected by the bucket through energy stored up in the bucket as it rotates from its spreading to its digging position,

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is:

1. In a device of the character described, the combination of a rotary scraper bucket, a hauling frame, a pair of control bars provided with journals for said bucket, means operatively connecting said bars with said frame, releasable stop means on said bars, stop means on said bucket cooperating therewith to control the angular position of said bucket, latch means for securing said bars to said frame when the bucket is in a digging position, and control means for said latch means and said releasable stop means and having a lost motion connection with the latter.

2. In a device of the character described, the combination of a rotary scraper bucket, hauling means, and means operable by the bucket as it turns relative to said hauling means for positively positioning said bucket in a digging position relative to said hauling means.

3. In a device of the character described, the

combination of a rotary scraper bucket, a hauling 3,"

frame, means connecting said hauling frame with the bucket for hauling said bucket in either a digging, dragging or spreading position, and means operated by the turning of the bucket from its spreading to its digging position to bring said connecting means into its position for hauling said bucket in its digging position.

l. In a device of the character described, the combination of a rotary scraper bucket, hauling means, and means operable through the momentum of the bucket as it turns relative to said hauling means for positioning said bucket in a digging position relative to said hauling means.

5. In a device of the character described, the combination of a rotary scraper bucket, a hauling frame, a pair of control bars provided with jour-. nals for said bucket, means operatively connecting said bars with said frame, stop means to limit the relative movement between said bars and frame, releasable stop means on said bars, stop means on said bucket cooperating with said releasable stop means to control the angular position of said bucket, latch means for securing said bars to said frame when the bucket is in a digging position, and control means for said latch means D and said releasable stop means.

6. In a device of the character described the combination of a rotary scraper bucket, a hauling frame, a pair of control'bars provided with journals for said bucket, links operatively connecting 0 said bars with said frame, adjustable stop means for limiting the movement of said links and thereby controlling the depth of the cut, releasable stops on said bars, and stops on said bucket engageable with said releasable stops in different angular positions of said bucket.

7. In a device of the character described, the combination of a rotary scraper bucket, articulated hauling means, said bucket mounted to revolve relative to said hauling means to a digging position, and means operable by the bucket as it turns relative to said hauling means to move parts of said hauling means relative to each other for positioning said bucket in a digging position.

JOSEPH H. KER/BER. 

